I tested them back to back, using lmills Smarty, on the same dyno, same day, back in early Oct. On the top end, with no other boxes in play, the Smarty made about 5 hp less than the power pup, both turned all the way up. That being said, I just got that same Smarty from Lloyd, since he got a new one. It drives like a different truck. So far, I have only used the 30 hp setting. My turbo now spools like the pp did on the extreme mode, which is very quick. My PP never caused me any issues.